package cgl.narada.transport.rtp;
/**
 * Software License, Version 1.0
 *
 * Copyright 2003 The Trustees of Indiana University.  All rights reserved.
 *
 *Redistribution and use in source and binary forms, with or without
 *modification, are permitted provided that the following conditions are met:
 *
 *1) All redistributions of source code must retain the above copyright notice,
 * the list of authors in the original source code, this list of conditions and
 * the disclaimer listed in this license;
 *2) All redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the disclaimer listed in this license in
 * the documentation and/or other materials provided with the distribution;
 *3) Any documentation included with all redistributions must include the
 * following acknowledgement:
 *
 *"This product includes software developed by the Community Grids Lab. For
 * further information contact the Community Grids Lab at
 * http://communitygrids.iu.edu/."
 *
 * Alternatively, this acknowledgement may appear in the software itself, and
 * wherever such third-party acknowledgments normally appear.
 *
 *4) The name Indiana University or Community Grids Lab or GlobalMMCS,
 * shall not be used to endorse or promote products derived from this software
 * without prior written permission from Indiana University.  For written
 * permission, please contact the Advanced Research and Technology Institute
 * ("ARTI") at 351 West 10th Street, Indianapolis, Indiana 46202.
 *5) Products derived from this software may not be called GlobalMMCS,
 * nor may Indiana University or Community Grids Lab or GlobalMMCS appear
 * in their name, without prior written permission of ARTI.
 *
 * Indiana University provides no reassurances that the source code provided
 * does not infringe the patent or any other intellectual property rights of
 * any other entity.  Indiana University disclaims any liability to any
 * recipient for claims brought by any other entity based on infringement of
 * intellectual property rights or otherwise.
 *
 *LICENSEE UNDERSTANDS THAT SOFTWARE IS PROVIDED "AS IS" FOR WHICH NO
 *WARRANTIES AS TO CAPABILITIES OR ACCURACY ARE MADE. INDIANA UNIVERSITY GIVES
 *NO WARRANTIES AND MAKES NO REPRESENTATION THAT SOFTWARE IS FREE OF
 *INFRINGEMENT OF THIRD PARTY PATENT, COPYRIGHT, OR OTHER PROPRIETARY RIGHTS.
 *INDIANA UNIVERSITY MAKES NO WARRANTIES THAT SOFTWARE IS FREE FROM "BUGS",
 *"VIRUSES", "TROJAN HORSES", "TRAP DOORS", "WORMS", OR OTHER HARMFUL CODE.
 *LICENSEE ASSUMES THE ENTIRE RISK AS TO THE PERFORMANCE OF SOFTWARE AND/OR
 *ASSOCIATED MATERIALS, AND TO THE PERFORMANCE AND VALIDITY OF INFORMATION
 *GENERATED USING SOFTWARE.
 */

import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;
import java.util.ArrayList;
import java.util.StringTokenizer;

import cgl.narada.matching.rtp.RtpEvent;
import cgl.narada.transport.TransportDebugFlags;
import cgl.narada.transport.TransportHandler;

/**
    This class is used to receive RTCP packages. It works with RTPMultiReceiver.
    It examines the ssrc number of each package and publish it to the appropriate topic
    according to the ssrc and topic number associations. <p>

    if there is no topic created for an ssrc, it discards that package.
    New topics are only created by RTPMultiReceiver class and accessed by this class.

    @author Ahmet Uyar
    $Revision: 1.2 $
*/
public class RTCPMultiReceiver extends Thread implements TransportDebugFlags {

   public final static int MAX_PACKET_SIZE = 65507;
   private DatagramSocket socket;
   private int port;
   private byte[] buffer = new byte[16000];
   private int messageTracker = 0;
   private String moduleName = "RTCPReceiverThread: ";
   private TransportHandler transportHandler;
   private int nodeIdentifier = 0;
   private boolean stopped = false;

   private ArrayList topicList; // this will hold StreamInfo objects
   private SessionTopicManager topicManager;
   private String linkID;

   public RTCPMultiReceiver(String linkID,
                            ArrayList topicList,
                            DatagramSocket socket,
                            TransportHandler transportHandler) {

     this.linkID = linkID;
      this.socket = socket;
      this.transportHandler = transportHandler;

      byte[] buffer = new byte[MAX_PACKET_SIZE];

      this.topicList = topicList;
   }

   public void setNodeIdentifier(int nodeId) {

      if (nodeIdentifier == 0) {
         nodeIdentifier = nodeId;
         return;
      }

      System.out.println(moduleName + "Error: Setting node identifier again?");
   }

   public void run() {
      DatagramPacket dp = new DatagramPacket(buffer, buffer.length);

      if (RTPReceiverThread_Debug) {
         System.out.println(moduleName + "waiting for Datagram packets on port " + socket.getLocalPort() + "...");
      }

      StringTokenizer token;
      int dataInfo;
      int dataLength;
      int port;
      String address;

      try {
         while ( !stopped ) {
            socket.receive(dp);

            byte[] data = dp.getData();
            port = dp.getPort();
            dataLength = dp.getLength();

            //System.out.print("[ r" + messageTracker+++",l"+ dataLength + "]\n");
//            String hostInfo = dp.getAddress().getHostName();
//            int portInfo = dp.getPort();
//            String sender = "rtp://" + hostInfo + ":" + port;

            if (RTPReceiverThread_Debug) {
               /**System.out.println(moduleName + "Received [" + new String(data, 1, dataLength-1) +
                  "] from (" + hostInfo + ":" + portInfo  + ")");*/
            }

            // if dataLength is less than 12, then this is not an rtp package
            if(dataLength < 12){
               continue;
            }

            int ssrc = getSSRC(data);
            StreamInfo info = new StreamInfo(ssrc);
            int topicNumber;
            if(topicList.contains(info)){
               StreamInfo theInfo = (StreamInfo)topicList.get( topicList.indexOf(info) );
               topicNumber = theInfo.getControlTopic();
            }else{
//               System.out.println("An RTP Control message is received with the ssrc: "+info.getSSRC() );
//               System.out.println("but there is no topic assigned to this stream yet.");
               continue;
            }

            /** The data received now has to be encapsulated into an event and
                subsequently propagated to the protocol layer via the dataReceived
                method in the transportHandler. */
            RtpEvent rtpEvent = new RtpEvent(nodeIdentifier, topicNumber, data, 0, dataLength);
            transportHandler.dataReceived(rtpEvent.getBytesWithClientFlag(), linkID);
            dp.setLength(buffer.length);
         }/* end while(true) */
      } catch (SocketException se) {
         if(se.getMessage().equals("socket closed"))
            return;
         se.printStackTrace();
      } catch (java.io.IOException ioe) {
         ioe.printStackTrace();
      }/* end try-catch*/
   }/* end (run) */

   public void close(){
      stopped = true;
      socket.close();
   }

   /**
    * return the ssrc number of this rtp package.
    */
   private int getSSRC(byte data[]){

      int ssrc = cgl.narada.util.ByteUtilities.getInt(data, 4);
      return ssrc;
   }
}



